Large dynamic range distributed phase sensing method and device based on optical path difference assistance

The invention discloses a large dynamic range distributed phase sensing method and device based on optical path difference assistance, and the device comprises an optical path difference measurement module, a phase measurement module, a multiplexing module, a scattering enhancement sensing optical fiber, and a data collection demodulation system. Optical path difference (OPD) demodulation with the characteristics of high noise and large dynamic range is combined with phase demodulation with low noise and high precision, and during data processing, OPD data with the large dynamic range is utilized to assist in completing unwrapping of low-noise phase data, phase unwrapping errors caused by the pi phase principle are corrected, phase unwrapping of large signals is achieved, and the phase demodulation precision is improved. And the measurement dynamic range is improved while the demodulation precision of the system is maintained. 本发明公开了一种基于光程差辅助的大动态范围分布式相位传感方法和装置，包括光程差测量模块、相位测量模块、复用模块、散射增强传感光纤以及数据采集解调系统，将具有高噪声、大